| 摘要 |
<p>The invention relates to a device and process, such as supercritical extraction, for separating a mixture or extracting a material, in which at least the following steps are carried out: a) treatment of the mixture or material with an extraction fluid in a treatment vessel, said extraction fluid entraining product from the mixture of material, which results in a laden extraction fluid which is discharged from the treatment vessel, b) separating product from the laden extraction fluid, which results in an extraction fluid depleted of product, c) increasing the density of the depleted extraction fluid of step b), and return thereof to the treatment vessel. This is achieved by increasing, in step c), the density of the depleted extraction fluid by cooling this fluid, and by heating this extraction fluid at a point in space, which is preferably situated lower down than the point at which the cooling of step c) is performed. The heating and cooling are preferably effected by means of heat exchangers which, on the one hand, have the extraction fluid flowing through them and, on the other hand, are incorporated in an auxiliary-fluid circuit. Via the auxiliary fluid, the process can be controlled and the transport of the extraction fluid can be provided for.</p> |
